linux-kernel - Re: [11/14] vcompound: Fallbacks for order 1 stack allocations on IA64 and x86

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Message-Id: <20080321.002502.223136918.davem@davemloft.net>
Date:	Fri, 21 Mar 2008 00:25:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	clameter@....com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [11/14] vcompound: Fallbacks for order 1 stack allocations on
 IA64 and x86

From: Christoph Lameter <clameter@....com>
Date: Thu, 20 Mar 2008 23:17:14 -0700

> This allows fallback for order 1 stack allocations. In the fallback
> scenario the stacks will be virtually mapped.
> 
> Signed-off-by: Christoph Lameter <clameter@....com>

I would be very careful with this especially on IA64.

If the TLB miss or other low-level trap handler depends upon being
able to dereference thread info, task struct, or kernel stack stuff
without causing a fault outside of the linear PAGE_OFFSET area, this
patch will cause problems.

It will be difficult to debug the kinds of crashes this will cause
too.
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